Mazda CX-5 Service & Repair Manual: Air Fuel Ratio (A/F) Sensor

Mazda CX-5 Service & Repair Manual / Engine / Control / Air Fuel Ratio (A/F) Sensor

Purpose/Function

Detects the oxygen concentration (all-range air/fuel ratio) in the exhaust gas as basic information for mainly determining the fuel injection amount.
Detects the oxygen concentration (all-range air/fuel ratio) in the exhaust gas and inputs it to the PCM as an oxygen concentration (all-range air/fuel ratio) signal.

Construction

Installed to the exhaust manifold.
A zirconium element has been adopted as the detecting element for detecting the oxygen concentration (all-range air/fuel ratio).

Operation

Inputs the signal, which fluctuates according to the oxygen concentration (all-range air/fuel ratio), to the PCM.

A/F sensor characteristic

Fail-safe


DTC No.	Fail-safe function
P0031:00	Stops the fuel feedback control.
P0032:00	Stops the fuel feedback control.
P0130:00	Fixes the duty value of the A/F sensor heater. Stops the fuel feedback control.
P0131:00	Fixes the duty value of the A/F sensor heater. Stops the fuel feedback control.
P0132:00	Fixes the duty value of the A/F sensor heater. Stops the fuel feedback control.
P0134:00	Fixes the duty value of the A/F sensor heater. Stops the fuel feedback control.
P064D:00	Fixes the duty value of the A/F sensor heater. Stops the fuel feedback control.
P2237:00	Fixes the duty value of the A/F sensor heater. Stops the fuel feedback control.
P2243:00	Fixes the duty value of the A/F sensor heater. Stops the fuel feedback control.
P2251:00	Fixes the duty value of the A/F sensor heater. Stops the fuel feedback control.

Air Fuel Ratio (A/F) Sensor Removal/Installation

WARNING: A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they are cool before removing the exhaust system. CAUTION: Do not allow fla ...

Camshaft Position (CMP) Sensor Inspection

Intake CMP Sensor Visual inspection CAUTION: When replacing the CMP sensor, make sure there is no foreign material on it such as metal shavings. If it is installed with foreign material, ...

Other materials:

Throttle Body Inspection
Resistance Inspection 1. Disconnect the negative battery cable.. 2. Disconnect the throttle body connector. 3. Measure the resistance between throttle body terminals E and F. Throttle body resistance 1.38 ohms [20°C {68 °F}] If not as specified, replace the throttle ...

Liftgate Latch And Lock Actuator Removal/Installation
1. Disconnect the negative battery cable.. 2. Remove the following parts: a. Liftgate upper trim. b. Liftgate side trim. c. Liftgate lower trim. 3. Disconnect the connector. 4. Remove the bolts. 5. Remove the liftgate latch and lock actuator from the liftgate. 6. Install in t ...

Mass Air Flow (MAF) Sensor/Intake Air Temperature (Iat) Sensor No.1 Removal/Installation
NOTE: Because the IAT sensor No.1 is integrated in the MAF sensor, replacing the IAT sensor No.1 includes replacement of the MAF sensor/IAT sensor No.1. 1. Disconnect the negative battery cable.. 2. Disconnect the MAF sensor/IAT sensor No.1 connector. 3. Remove the MAF sensor/IA ...